The boot stub does not emit a .fixup section at all anymore, so remove
it.

Link: https://lore.kernel.org/lkml/202002080058.FD1DDB1@keescook/Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>